net: return operator cleanup
[linux-3.10.git] / net / ipv4 / inet_diag.c
1 /*
2  * inet_diag.c  Module for monitoring INET transport protocols sockets.
3  *
4  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
5  *
6  *      This program is free software; you can redistribute it and/or
7  *      modify it under the terms of the GNU General Public License
8  *      as published by the Free Software Foundation; either version
9  *      2 of the License, or (at your option) any later version.
10  */
11
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/types.h>
15 #include <linux/fcntl.h>
16 #include <linux/random.h>
17 #include <linux/slab.h>
18 #include <linux/cache.h>
19 #include <linux/init.h>
20 #include <linux/time.h>
21
22 #include <net/icmp.h>
23 #include <net/tcp.h>
24 #include <net/ipv6.h>
25 #include <net/inet_common.h>
26 #include <net/inet_connection_sock.h>
27 #include <net/inet_hashtables.h>
28 #include <net/inet_timewait_sock.h>
29 #include <net/inet6_hashtables.h>
30 #include <net/netlink.h>
31
32 #include <linux/inet.h>
33 #include <linux/stddef.h>
34
35 #include <linux/inet_diag.h>
36
37 static const struct inet_diag_handler **inet_diag_table;
38
39 struct inet_diag_entry {
40         __be32 *saddr;
41         __be32 *daddr;
42         u16 sport;
43         u16 dport;
44         u16 family;
45         u16 userlocks;
46 };
47
48 static struct sock *idiagnl;
49
50 #define INET_DIAG_PUT(skb, attrtype, attrlen) \
51         RTA_DATA(__RTA_PUT(skb, attrtype, attrlen))
52
53 static DEFINE_MUTEX(inet_diag_table_mutex);
54
55 static const struct inet_diag_handler *inet_diag_lock_handler(int type)
56 {
57         if (!inet_diag_table[type])
58                 request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
59                                NETLINK_INET_DIAG, type);
60
61         mutex_lock(&inet_diag_table_mutex);
62         if (!inet_diag_table[type])
63                 return ERR_PTR(-ENOENT);
64
65         return inet_diag_table[type];
66 }
67
68 static inline void inet_diag_unlock_handler(
69         const struct inet_diag_handler *handler)
70 {
71         mutex_unlock(&inet_diag_table_mutex);
72 }
73
74 static int inet_csk_diag_fill(struct sock *sk,
75                               struct sk_buff *skb,
76                               int ext, u32 pid, u32 seq, u16 nlmsg_flags,
77                               const struct nlmsghdr *unlh)
78 {
79         const struct inet_sock *inet = inet_sk(sk);
80         const struct inet_connection_sock *icsk = inet_csk(sk);
81         struct inet_diag_msg *r;
82         struct nlmsghdr  *nlh;
83         void *info = NULL;
84         struct inet_diag_meminfo  *minfo = NULL;
85         unsigned char    *b = skb_tail_pointer(skb);
86         const struct inet_diag_handler *handler;
87
88         handler = inet_diag_table[unlh->nlmsg_type];
89         BUG_ON(handler == NULL);
90
91         nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
92         nlh->nlmsg_flags = nlmsg_flags;
93
94         r = NLMSG_DATA(nlh);
95         BUG_ON(sk->sk_state == TCP_TIME_WAIT);
96
97         if (ext & (1 << (INET_DIAG_MEMINFO - 1)))
98                 minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo));
99
100         if (ext & (1 << (INET_DIAG_INFO - 1)))
101                 info = INET_DIAG_PUT(skb, INET_DIAG_INFO,
102                                      handler->idiag_info_size);
103
104         if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) {
105                 const size_t len = strlen(icsk->icsk_ca_ops->name);
106
107                 strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1),
108                        icsk->icsk_ca_ops->name);
109         }
110
111         r->idiag_family = sk->sk_family;
112         r->idiag_state = sk->sk_state;
113         r->idiag_timer = 0;
114         r->idiag_retrans = 0;
115
116         r->id.idiag_if = sk->sk_bound_dev_if;
117         r->id.idiag_cookie[0] = (u32)(unsigned long)sk;
118         r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
119
120         r->id.idiag_sport = inet->inet_sport;
121         r->id.idiag_dport = inet->inet_dport;
122         r->id.idiag_src[0] = inet->inet_rcv_saddr;
123         r->id.idiag_dst[0] = inet->inet_daddr;
124
125 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
126         if (r->idiag_family == AF_INET6) {
127                 struct ipv6_pinfo *np = inet6_sk(sk);
128
129                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
130                                &np->rcv_saddr);
131                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
132                                &np->daddr);
133         }
134 #endif
135
136 #define EXPIRES_IN_MS(tmo)  DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
137
138         if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
139                 r->idiag_timer = 1;
140                 r->idiag_retrans = icsk->icsk_retransmits;
141                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
142         } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
143                 r->idiag_timer = 4;
144                 r->idiag_retrans = icsk->icsk_probes_out;
145                 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
146         } else if (timer_pending(&sk->sk_timer)) {
147                 r->idiag_timer = 2;
148                 r->idiag_retrans = icsk->icsk_probes_out;
149                 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
150         } else {
151                 r->idiag_timer = 0;
152                 r->idiag_expires = 0;
153         }
154 #undef EXPIRES_IN_MS
155
156         r->idiag_uid = sock_i_uid(sk);
157         r->idiag_inode = sock_i_ino(sk);
158
159         if (minfo) {
160                 minfo->idiag_rmem = sk_rmem_alloc_get(sk);
161                 minfo->idiag_wmem = sk->sk_wmem_queued;
162                 minfo->idiag_fmem = sk->sk_forward_alloc;
163                 minfo->idiag_tmem = sk_wmem_alloc_get(sk);
164         }
165
166         handler->idiag_get_info(sk, r, info);
167
168         if (sk->sk_state < TCP_TIME_WAIT &&
169             icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
170                 icsk->icsk_ca_ops->get_info(sk, ext, skb);
171
172         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
173         return skb->len;
174
175 rtattr_failure:
176 nlmsg_failure:
177         nlmsg_trim(skb, b);
178         return -EMSGSIZE;
179 }
180
181 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
182                                struct sk_buff *skb, int ext, u32 pid,
183                                u32 seq, u16 nlmsg_flags,
184                                const struct nlmsghdr *unlh)
185 {
186         long tmo;
187         struct inet_diag_msg *r;
188         const unsigned char *previous_tail = skb_tail_pointer(skb);
189         struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq,
190                                          unlh->nlmsg_type, sizeof(*r));
191
192         r = NLMSG_DATA(nlh);
193         BUG_ON(tw->tw_state != TCP_TIME_WAIT);
194
195         nlh->nlmsg_flags = nlmsg_flags;
196
197         tmo = tw->tw_ttd - jiffies;
198         if (tmo < 0)
199                 tmo = 0;
200
201         r->idiag_family       = tw->tw_family;
202         r->idiag_retrans      = 0;
203         r->id.idiag_if        = tw->tw_bound_dev_if;
204         r->id.idiag_cookie[0] = (u32)(unsigned long)tw;
205         r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1);
206         r->id.idiag_sport     = tw->tw_sport;
207         r->id.idiag_dport     = tw->tw_dport;
208         r->id.idiag_src[0]    = tw->tw_rcv_saddr;
209         r->id.idiag_dst[0]    = tw->tw_daddr;
210         r->idiag_state        = tw->tw_substate;
211         r->idiag_timer        = 3;
212         r->idiag_expires      = DIV_ROUND_UP(tmo * 1000, HZ);
213         r->idiag_rqueue       = 0;
214         r->idiag_wqueue       = 0;
215         r->idiag_uid          = 0;
216         r->idiag_inode        = 0;
217 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
218         if (tw->tw_family == AF_INET6) {
219                 const struct inet6_timewait_sock *tw6 =
220                                                 inet6_twsk((struct sock *)tw);
221
222                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
223                                &tw6->tw_v6_rcv_saddr);
224                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
225                                &tw6->tw_v6_daddr);
226         }
227 #endif
228         nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail;
229         return skb->len;
230 nlmsg_failure:
231         nlmsg_trim(skb, previous_tail);
232         return -EMSGSIZE;
233 }
234
235 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
236                         int ext, u32 pid, u32 seq, u16 nlmsg_flags,
237                         const struct nlmsghdr *unlh)
238 {
239         if (sk->sk_state == TCP_TIME_WAIT)
240                 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk,
241                                            skb, ext, pid, seq, nlmsg_flags,
242                                            unlh);
243         return inet_csk_diag_fill(sk, skb, ext, pid, seq, nlmsg_flags, unlh);
244 }
245
246 static int inet_diag_get_exact(struct sk_buff *in_skb,
247                                const struct nlmsghdr *nlh)
248 {
249         int err;
250         struct sock *sk;
251         struct inet_diag_req *req = NLMSG_DATA(nlh);
252         struct sk_buff *rep;
253         struct inet_hashinfo *hashinfo;
254         const struct inet_diag_handler *handler;
255
256         handler = inet_diag_lock_handler(nlh->nlmsg_type);
257         if (IS_ERR(handler)) {
258                 err = PTR_ERR(handler);
259                 goto unlock;
260         }
261
262         hashinfo = handler->idiag_hashinfo;
263         err = -EINVAL;
264
265         if (req->idiag_family == AF_INET) {
266                 sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0],
267                                  req->id.idiag_dport, req->id.idiag_src[0],
268                                  req->id.idiag_sport, req->id.idiag_if);
269         }
270 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
271         else if (req->idiag_family == AF_INET6) {
272                 sk = inet6_lookup(&init_net, hashinfo,
273                                   (struct in6_addr *)req->id.idiag_dst,
274                                   req->id.idiag_dport,
275                                   (struct in6_addr *)req->id.idiag_src,
276                                   req->id.idiag_sport,
277                                   req->id.idiag_if);
278         }
279 #endif
280         else {
281                 goto unlock;
282         }
283
284         err = -ENOENT;
285         if (sk == NULL)
286                 goto unlock;
287
288         err = -ESTALE;
289         if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE ||
290              req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) &&
291             ((u32)(unsigned long)sk != req->id.idiag_cookie[0] ||
292              (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1]))
293                 goto out;
294
295         err = -ENOMEM;
296         rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) +
297                                      sizeof(struct inet_diag_meminfo) +
298                                      handler->idiag_info_size + 64)),
299                         GFP_KERNEL);
300         if (!rep)
301                 goto out;
302
303         err = sk_diag_fill(sk, rep, req->idiag_ext,
304                            NETLINK_CB(in_skb).pid,
305                            nlh->nlmsg_seq, 0, nlh);
306         if (err < 0) {
307                 WARN_ON(err == -EMSGSIZE);
308                 kfree_skb(rep);
309                 goto out;
310         }
311         err = netlink_unicast(idiagnl, rep, NETLINK_CB(in_skb).pid,
312                               MSG_DONTWAIT);
313         if (err > 0)
314                 err = 0;
315
316 out:
317         if (sk) {
318                 if (sk->sk_state == TCP_TIME_WAIT)
319                         inet_twsk_put((struct inet_timewait_sock *)sk);
320                 else
321                         sock_put(sk);
322         }
323 unlock:
324         inet_diag_unlock_handler(handler);
325         return err;
326 }
327
328 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
329 {
330         int words = bits >> 5;
331
332         bits &= 0x1f;
333
334         if (words) {
335                 if (memcmp(a1, a2, words << 2))
336                         return 0;
337         }
338         if (bits) {
339                 __be32 w1, w2;
340                 __be32 mask;
341
342                 w1 = a1[words];
343                 w2 = a2[words];
344
345                 mask = htonl((0xffffffff) << (32 - bits));
346
347                 if ((w1 ^ w2) & mask)
348                         return 0;
349         }
350
351         return 1;
352 }
353
354
355 static int inet_diag_bc_run(const void *bc, int len,
356                             const struct inet_diag_entry *entry)
357 {
358         while (len > 0) {
359                 int yes = 1;
360                 const struct inet_diag_bc_op *op = bc;
361
362                 switch (op->code) {
363                 case INET_DIAG_BC_NOP:
364                         break;
365                 case INET_DIAG_BC_JMP:
366                         yes = 0;
367                         break;
368                 case INET_DIAG_BC_S_GE:
369                         yes = entry->sport >= op[1].no;
370                         break;
371                 case INET_DIAG_BC_S_LE:
372                         yes = entry->sport <= op[1].no;
373                         break;
374                 case INET_DIAG_BC_D_GE:
375                         yes = entry->dport >= op[1].no;
376                         break;
377                 case INET_DIAG_BC_D_LE:
378                         yes = entry->dport <= op[1].no;
379                         break;
380                 case INET_DIAG_BC_AUTO:
381                         yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
382                         break;
383                 case INET_DIAG_BC_S_COND:
384                 case INET_DIAG_BC_D_COND: {
385                         struct inet_diag_hostcond *cond;
386                         __be32 *addr;
387
388                         cond = (struct inet_diag_hostcond *)(op + 1);
389                         if (cond->port != -1 &&
390                             cond->port != (op->code == INET_DIAG_BC_S_COND ?
391                                              entry->sport : entry->dport)) {
392                                 yes = 0;
393                                 break;
394                         }
395
396                         if (cond->prefix_len == 0)
397                                 break;
398
399                         if (op->code == INET_DIAG_BC_S_COND)
400                                 addr = entry->saddr;
401                         else
402                                 addr = entry->daddr;
403
404                         if (bitstring_match(addr, cond->addr,
405                                             cond->prefix_len))
406                                 break;
407                         if (entry->family == AF_INET6 &&
408                             cond->family == AF_INET) {
409                                 if (addr[0] == 0 && addr[1] == 0 &&
410                                     addr[2] == htonl(0xffff) &&
411                                     bitstring_match(addr + 3, cond->addr,
412                                                     cond->prefix_len))
413                                         break;
414                         }
415                         yes = 0;
416                         break;
417                 }
418                 }
419
420                 if (yes) {
421                         len -= op->yes;
422                         bc += op->yes;
423                 } else {
424                         len -= op->no;
425                         bc += op->no;
426                 }
427         }
428         return len == 0;
429 }
430
431 static int valid_cc(const void *bc, int len, int cc)
432 {
433         while (len >= 0) {
434                 const struct inet_diag_bc_op *op = bc;
435
436                 if (cc > len)
437                         return 0;
438                 if (cc == len)
439                         return 1;
440                 if (op->yes < 4)
441                         return 0;
442                 len -= op->yes;
443                 bc  += op->yes;
444         }
445         return 0;
446 }
447
448 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
449 {
450         const unsigned char *bc = bytecode;
451         int  len = bytecode_len;
452
453         while (len > 0) {
454                 struct inet_diag_bc_op *op = (struct inet_diag_bc_op *)bc;
455
456 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
457                 switch (op->code) {
458                 case INET_DIAG_BC_AUTO:
459                 case INET_DIAG_BC_S_COND:
460                 case INET_DIAG_BC_D_COND:
461                 case INET_DIAG_BC_S_GE:
462                 case INET_DIAG_BC_S_LE:
463                 case INET_DIAG_BC_D_GE:
464                 case INET_DIAG_BC_D_LE:
465                         if (op->yes < 4 || op->yes > len + 4)
466                                 return -EINVAL;
467                 case INET_DIAG_BC_JMP:
468                         if (op->no < 4 || op->no > len + 4)
469                                 return -EINVAL;
470                         if (op->no < len &&
471                             !valid_cc(bytecode, bytecode_len, len - op->no))
472                                 return -EINVAL;
473                         break;
474                 case INET_DIAG_BC_NOP:
475                         if (op->yes < 4 || op->yes > len + 4)
476                                 return -EINVAL;
477                         break;
478                 default:
479                         return -EINVAL;
480                 }
481                 bc  += op->yes;
482                 len -= op->yes;
483         }
484         return len == 0 ? 0 : -EINVAL;
485 }
486
487 static int inet_csk_diag_dump(struct sock *sk,
488                               struct sk_buff *skb,
489                               struct netlink_callback *cb)
490 {
491         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
492
493         if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
494                 struct inet_diag_entry entry;
495                 struct rtattr *bc = (struct rtattr *)(r + 1);
496                 struct inet_sock *inet = inet_sk(sk);
497
498                 entry.family = sk->sk_family;
499 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
500                 if (entry.family == AF_INET6) {
501                         struct ipv6_pinfo *np = inet6_sk(sk);
502
503                         entry.saddr = np->rcv_saddr.s6_addr32;
504                         entry.daddr = np->daddr.s6_addr32;
505                 } else
506 #endif
507                 {
508                         entry.saddr = &inet->inet_rcv_saddr;
509                         entry.daddr = &inet->inet_daddr;
510                 }
511                 entry.sport = inet->inet_num;
512                 entry.dport = ntohs(inet->inet_dport);
513                 entry.userlocks = sk->sk_userlocks;
514
515                 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
516                         return 0;
517         }
518
519         return inet_csk_diag_fill(sk, skb, r->idiag_ext,
520                                   NETLINK_CB(cb->skb).pid,
521                                   cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
522 }
523
524 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw,
525                                struct sk_buff *skb,
526                                struct netlink_callback *cb)
527 {
528         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
529
530         if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
531                 struct inet_diag_entry entry;
532                 struct rtattr *bc = (struct rtattr *)(r + 1);
533
534                 entry.family = tw->tw_family;
535 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
536                 if (tw->tw_family == AF_INET6) {
537                         struct inet6_timewait_sock *tw6 =
538                                                 inet6_twsk((struct sock *)tw);
539                         entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32;
540                         entry.daddr = tw6->tw_v6_daddr.s6_addr32;
541                 } else
542 #endif
543                 {
544                         entry.saddr = &tw->tw_rcv_saddr;
545                         entry.daddr = &tw->tw_daddr;
546                 }
547                 entry.sport = tw->tw_num;
548                 entry.dport = ntohs(tw->tw_dport);
549                 entry.userlocks = 0;
550
551                 if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
552                         return 0;
553         }
554
555         return inet_twsk_diag_fill(tw, skb, r->idiag_ext,
556                                    NETLINK_CB(cb->skb).pid,
557                                    cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
558 }
559
560 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
561                               struct request_sock *req, u32 pid, u32 seq,
562                               const struct nlmsghdr *unlh)
563 {
564         const struct inet_request_sock *ireq = inet_rsk(req);
565         struct inet_sock *inet = inet_sk(sk);
566         unsigned char *b = skb_tail_pointer(skb);
567         struct inet_diag_msg *r;
568         struct nlmsghdr *nlh;
569         long tmo;
570
571         nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
572         nlh->nlmsg_flags = NLM_F_MULTI;
573         r = NLMSG_DATA(nlh);
574
575         r->idiag_family = sk->sk_family;
576         r->idiag_state = TCP_SYN_RECV;
577         r->idiag_timer = 1;
578         r->idiag_retrans = req->retrans;
579
580         r->id.idiag_if = sk->sk_bound_dev_if;
581         r->id.idiag_cookie[0] = (u32)(unsigned long)req;
582         r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1);
583
584         tmo = req->expires - jiffies;
585         if (tmo < 0)
586                 tmo = 0;
587
588         r->id.idiag_sport = inet->inet_sport;
589         r->id.idiag_dport = ireq->rmt_port;
590         r->id.idiag_src[0] = ireq->loc_addr;
591         r->id.idiag_dst[0] = ireq->rmt_addr;
592         r->idiag_expires = jiffies_to_msecs(tmo);
593         r->idiag_rqueue = 0;
594         r->idiag_wqueue = 0;
595         r->idiag_uid = sock_i_uid(sk);
596         r->idiag_inode = 0;
597 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
598         if (r->idiag_family == AF_INET6) {
599                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
600                                &inet6_rsk(req)->loc_addr);
601                 ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
602                                &inet6_rsk(req)->rmt_addr);
603         }
604 #endif
605         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
606
607         return skb->len;
608
609 nlmsg_failure:
610         nlmsg_trim(skb, b);
611         return -1;
612 }
613
614 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
615                                struct netlink_callback *cb)
616 {
617         struct inet_diag_entry entry;
618         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
619         struct inet_connection_sock *icsk = inet_csk(sk);
620         struct listen_sock *lopt;
621         struct rtattr *bc = NULL;
622         struct inet_sock *inet = inet_sk(sk);
623         int j, s_j;
624         int reqnum, s_reqnum;
625         int err = 0;
626
627         s_j = cb->args[3];
628         s_reqnum = cb->args[4];
629
630         if (s_j > 0)
631                 s_j--;
632
633         entry.family = sk->sk_family;
634
635         read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
636
637         lopt = icsk->icsk_accept_queue.listen_opt;
638         if (!lopt || !lopt->qlen)
639                 goto out;
640
641         if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
642                 bc = (struct rtattr *)(r + 1);
643                 entry.sport = inet->inet_num;
644                 entry.userlocks = sk->sk_userlocks;
645         }
646
647         for (j = s_j; j < lopt->nr_table_entries; j++) {
648                 struct request_sock *req, *head = lopt->syn_table[j];
649
650                 reqnum = 0;
651                 for (req = head; req; reqnum++, req = req->dl_next) {
652                         struct inet_request_sock *ireq = inet_rsk(req);
653
654                         if (reqnum < s_reqnum)
655                                 continue;
656                         if (r->id.idiag_dport != ireq->rmt_port &&
657                             r->id.idiag_dport)
658                                 continue;
659
660                         if (bc) {
661                                 entry.saddr =
662 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
663                                         (entry.family == AF_INET6) ?
664                                         inet6_rsk(req)->loc_addr.s6_addr32 :
665 #endif
666                                         &ireq->loc_addr;
667                                 entry.daddr =
668 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
669                                         (entry.family == AF_INET6) ?
670                                         inet6_rsk(req)->rmt_addr.s6_addr32 :
671 #endif
672                                         &ireq->rmt_addr;
673                                 entry.dport = ntohs(ireq->rmt_port);
674
675                                 if (!inet_diag_bc_run(RTA_DATA(bc),
676                                                     RTA_PAYLOAD(bc), &entry))
677                                         continue;
678                         }
679
680                         err = inet_diag_fill_req(skb, sk, req,
681                                                NETLINK_CB(cb->skb).pid,
682                                                cb->nlh->nlmsg_seq, cb->nlh);
683                         if (err < 0) {
684                                 cb->args[3] = j + 1;
685                                 cb->args[4] = reqnum;
686                                 goto out;
687                         }
688                 }
689
690                 s_reqnum = 0;
691         }
692
693 out:
694         read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
695
696         return err;
697 }
698
699 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
700 {
701         int i, num;
702         int s_i, s_num;
703         struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
704         const struct inet_diag_handler *handler;
705         struct inet_hashinfo *hashinfo;
706
707         handler = inet_diag_lock_handler(cb->nlh->nlmsg_type);
708         if (IS_ERR(handler))
709                 goto unlock;
710
711         hashinfo = handler->idiag_hashinfo;
712
713         s_i = cb->args[1];
714         s_num = num = cb->args[2];
715
716         if (cb->args[0] == 0) {
717                 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
718                         goto skip_listen_ht;
719
720                 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
721                         struct sock *sk;
722                         struct hlist_nulls_node *node;
723                         struct inet_listen_hashbucket *ilb;
724
725                         num = 0;
726                         ilb = &hashinfo->listening_hash[i];
727                         spin_lock_bh(&ilb->lock);
728                         sk_nulls_for_each(sk, node, &ilb->head) {
729                                 struct inet_sock *inet = inet_sk(sk);
730
731                                 if (num < s_num) {
732                                         num++;
733                                         continue;
734                                 }
735
736                                 if (r->id.idiag_sport != inet->inet_sport &&
737                                     r->id.idiag_sport)
738                                         goto next_listen;
739
740                                 if (!(r->idiag_states & TCPF_LISTEN) ||
741                                     r->id.idiag_dport ||
742                                     cb->args[3] > 0)
743                                         goto syn_recv;
744
745                                 if (inet_csk_diag_dump(sk, skb, cb) < 0) {
746                                         spin_unlock_bh(&ilb->lock);
747                                         goto done;
748                                 }
749
750 syn_recv:
751                                 if (!(r->idiag_states & TCPF_SYN_RECV))
752                                         goto next_listen;
753
754                                 if (inet_diag_dump_reqs(skb, sk, cb) < 0) {
755                                         spin_unlock_bh(&ilb->lock);
756                                         goto done;
757                                 }
758
759 next_listen:
760                                 cb->args[3] = 0;
761                                 cb->args[4] = 0;
762                                 ++num;
763                         }
764                         spin_unlock_bh(&ilb->lock);
765
766                         s_num = 0;
767                         cb->args[3] = 0;
768                         cb->args[4] = 0;
769                 }
770 skip_listen_ht:
771                 cb->args[0] = 1;
772                 s_i = num = s_num = 0;
773         }
774
775         if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
776                 goto unlock;
777
778         for (i = s_i; i <= hashinfo->ehash_mask; i++) {
779                 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
780                 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
781                 struct sock *sk;
782                 struct hlist_nulls_node *node;
783
784                 num = 0;
785
786                 if (hlist_nulls_empty(&head->chain) &&
787                         hlist_nulls_empty(&head->twchain))
788                         continue;
789
790                 if (i > s_i)
791                         s_num = 0;
792
793                 spin_lock_bh(lock);
794                 sk_nulls_for_each(sk, node, &head->chain) {
795                         struct inet_sock *inet = inet_sk(sk);
796
797                         if (num < s_num)
798                                 goto next_normal;
799                         if (!(r->idiag_states & (1 << sk->sk_state)))
800                                 goto next_normal;
801                         if (r->id.idiag_sport != inet->inet_sport &&
802                             r->id.idiag_sport)
803                                 goto next_normal;
804                         if (r->id.idiag_dport != inet->inet_dport &&
805                             r->id.idiag_dport)
806                                 goto next_normal;
807                         if (inet_csk_diag_dump(sk, skb, cb) < 0) {
808                                 spin_unlock_bh(lock);
809                                 goto done;
810                         }
811 next_normal:
812                         ++num;
813                 }
814
815                 if (r->idiag_states & TCPF_TIME_WAIT) {
816                         struct inet_timewait_sock *tw;
817
818                         inet_twsk_for_each(tw, node,
819                                     &head->twchain) {
820
821                                 if (num < s_num)
822                                         goto next_dying;
823                                 if (r->id.idiag_sport != tw->tw_sport &&
824                                     r->id.idiag_sport)
825                                         goto next_dying;
826                                 if (r->id.idiag_dport != tw->tw_dport &&
827                                     r->id.idiag_dport)
828                                         goto next_dying;
829                                 if (inet_twsk_diag_dump(tw, skb, cb) < 0) {
830                                         spin_unlock_bh(lock);
831                                         goto done;
832                                 }
833 next_dying:
834                                 ++num;
835                         }
836                 }
837                 spin_unlock_bh(lock);
838         }
839
840 done:
841         cb->args[1] = i;
842         cb->args[2] = num;
843 unlock:
844         inet_diag_unlock_handler(handler);
845         return skb->len;
846 }
847
848 static int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
849 {
850         int hdrlen = sizeof(struct inet_diag_req);
851
852         if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
853             nlmsg_len(nlh) < hdrlen)
854                 return -EINVAL;
855
856         if (nlh->nlmsg_flags & NLM_F_DUMP) {
857                 if (nlmsg_attrlen(nlh, hdrlen)) {
858                         struct nlattr *attr;
859
860                         attr = nlmsg_find_attr(nlh, hdrlen,
861                                                INET_DIAG_REQ_BYTECODE);
862                         if (attr == NULL ||
863                             nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
864                             inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
865                                 return -EINVAL;
866                 }
867
868                 return netlink_dump_start(idiagnl, skb, nlh,
869                                           inet_diag_dump, NULL);
870         }
871
872         return inet_diag_get_exact(skb, nlh);
873 }
874
875 static DEFINE_MUTEX(inet_diag_mutex);
876
877 static void inet_diag_rcv(struct sk_buff *skb)
878 {
879         mutex_lock(&inet_diag_mutex);
880         netlink_rcv_skb(skb, &inet_diag_rcv_msg);
881         mutex_unlock(&inet_diag_mutex);
882 }
883
884 int inet_diag_register(const struct inet_diag_handler *h)
885 {
886         const __u16 type = h->idiag_type;
887         int err = -EINVAL;
888
889         if (type >= INET_DIAG_GETSOCK_MAX)
890                 goto out;
891
892         mutex_lock(&inet_diag_table_mutex);
893         err = -EEXIST;
894         if (inet_diag_table[type] == NULL) {
895                 inet_diag_table[type] = h;
896                 err = 0;
897         }
898         mutex_unlock(&inet_diag_table_mutex);
899 out:
900         return err;
901 }
902 EXPORT_SYMBOL_GPL(inet_diag_register);
903
904 void inet_diag_unregister(const struct inet_diag_handler *h)
905 {
906         const __u16 type = h->idiag_type;
907
908         if (type >= INET_DIAG_GETSOCK_MAX)
909                 return;
910
911         mutex_lock(&inet_diag_table_mutex);
912         inet_diag_table[type] = NULL;
913         mutex_unlock(&inet_diag_table_mutex);
914 }
915 EXPORT_SYMBOL_GPL(inet_diag_unregister);
916
917 static int __init inet_diag_init(void)
918 {
919         const int inet_diag_table_size = (INET_DIAG_GETSOCK_MAX *
920                                           sizeof(struct inet_diag_handler *));
921         int err = -ENOMEM;
922
923         inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
924         if (!inet_diag_table)
925                 goto out;
926
927         idiagnl = netlink_kernel_create(&init_net, NETLINK_INET_DIAG, 0,
928                                         inet_diag_rcv, NULL, THIS_MODULE);
929         if (idiagnl == NULL)
930                 goto out_free_table;
931         err = 0;
932 out:
933         return err;
934 out_free_table:
935         kfree(inet_diag_table);
936         goto out;
937 }
938
939 static void __exit inet_diag_exit(void)
940 {
941         netlink_kernel_release(idiagnl);
942         kfree(inet_diag_table);
943 }
944
945 module_init(inet_diag_init);
946 module_exit(inet_diag_exit);
947 MODULE_LICENSE("GPL");
948 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_INET_DIAG);